Car seat



March 3l, 1942. A, c, MACBETHl 2,277,875

GAR SEAT Fiied sept. 22, 1939 I. Y l.. 6'/ a l f Tommy;

Patented Mar. 31, 1942 UN i TE D STT 91 trice 3 Claims.

This invention relates to car-seat construction and especially to the construction of a seat of which the load-sustaining surface is cushioned by springs or their equivalent in elastic shockabsorbing means. For its object the invention aims to perfect the construction of car seats by an advanced application of the springs, providing a seat of greater stability than heretofore and one in which substantially uniform cushioning is obtained irrespective of the applied weight. It is, more particularly, a principal object of the invention to devise a spring arrangement functioning to distribute load more effectively than heretofore and thereby eliminate the spot vibrations of the ordinary seat.

The invention consists in the novel construction and in the adaptation and combination of parts hereinafter described and claimed.

In the drawing:

Figure l is an underside plan view illustrating a car seat constructed in accordance with the present invention.

Fig. 2 is a transverse vertical section taken to an enlarged scale on line 2-2 of Fig. 1.

Fig. 3 is a fragmentary longitudinal vertical section on line 3--3 of Fig. 2; and

Fig. 4 is a fragmentary longitudinal vertical section on line 4-4 of Fig. 2.

In said drawing the numerals 5-6 denote the side and end sill pieces of a rectangular bed functioning as the base for the seat proper which I indicate as comprising a at plate 1 padded as at 8 and surfaced with the conventional upholstering 9. In accordance with the present invention said seat is provided at its opposite ends, considered longitudinally, with lever bars arranged in pairs 0f which the one bar IU of each pair is pivotally hung from a lug II xed to one of the side sills 5 and the complementary bar i2 pivotally hung from a lug I3 fixed to the other side sill. These two lever bars cross one another in the substantial median line of the seat, at which point the same interconnect through the instrumentality of a bolt I4 carried by the one bar and riding in a slot I5 of the other bar. Each of the bars, at a point intermediate the interconnecting centers and their respective pivoted ends, is ful-v crumed as at I6 and I'I to respective hangers I8 and I9 pendent from plate 1.

Functioning to yieldingly elevate the plate above the bed sills are multiple tension springs applied to the ends and centers of the crossed lever bars and extending therefrom to the plate,

such end springs, denoted by 20 and 2I, being desirably open-Wound Whereas the center springs 22-23 are close-wound for greater stretch resistance. As will be seen from an inspection of the drawing the center spring 23 lies perpendicularly whereas the other center spring 22 and each end spring 20 and 2I are disposed diagonally, an arrangement whereby spring 23 is immediately resistant to initial compression of the seat and is augmented rst by the spring 22 and then by the terminal springs 20 and 2 I.

In furtherance of` the oflice of the springs 20, 2| and 22, particularly as distinguished from a perpendicular spring, a comparison of the strains is best understood by graphing the relative degree to which two lines, one extending at right angles and the other diagonally between parallel planes, are caused to stretchby separation of the planes. While substantially uniform in the instance of the perpendicular spring, the increase in the effective resistance of the diagonal spring mounts progressively as the axial line of the spring is caused to approach the vertical.

It will of course be apparent that my arrangement of the bars in the seat functions to distribute compression stresses transversely thereof in that movement of either of the two bars I0 and I2 nds a corresponding movement of the complementary bar.

While illustrating the now preferred embodiment of the invention modications will readily occur to those skilled in the art land it is therefore my intention that the hereto annexed claims be given a scope in their interpretation commensurate with the state of the advance.

What I claim, is:

1. In a car seat, the combination of a bed part, a seat part disposed in elevated relation to the bed part and providing pendent hangers adjacent each side of the latter, a lever arm extending the approximate width of the bed part pivotally connected at one end to a side of the bed part and fulcrumed in proximity of said pivoted end to a seat-carried hanger, a complementary lever arm correspondingly fulcrumed and pivoted at the opposite side of the seat and traversing the rstnamed lever arm on the longitudinal median line of the seat, connection between said crossed arms at the point of juncture thereof coupling the arms for corresponding vertical movement, and

tension springs extending from the coupled centers and from the free ends of the lever arms to the seat part for yieldingly sustaining a load upon the seat part.

2. In a car seat, the combination of a bed part,

a seat part disposed in elevated relation to the bed part, a lever arm pivotally connected at one end to a side of the bed part and fulcrumed in proximity of said pivot to the seat part, a lever arm complementing said first-named lever arm and correspondingly pivoted and fulcrumed at the opposite side of the seat to traverse the rstnamed arm on the longitudinal median line of the seat, connection between the crossed arms coupling the same for corresponding vertical movement about their respective pivots and fulcrnms as axes, and tension springs extending from the coupled centers and from the free ends of the lever arms to the seat part for yieldingly sustaining a load upon the latter.

3. In a car seat, the combination of a bed part, a seat part disposed in elevated relation to the bed part, a lever arm pivotally connected at one end to a side of the bed part and fulcrumed in proximity of said pivot to the seat part, a lever arm complementing said first-named lever arm and correspondingly pivoted and fulcrumed at the opposite side of the seat to traverse the rst named arm on the longitudinal median line of the seat, connection at the point of juncture of the arms coupling the same for corresponding vertical movement about their respective pivots and fulcrums as axes, tension springs extending diagonally from the free ends of the lever arms to the seat part for yieldingly sustaining a load upon the latter, and a pair of tension springs eX- `tending between the seat part and the center connection of the arms, one of said center springs being disposed perpendicularly and the other diagonally.

ALBERT C. MACBETH. 

